I need a fully-functional hotel management app that works smoothly both on Android phones/tablets and through any modern web browser. The core of the system must let me: • Handle room bookings in real time, including availability search, check-in/check-out tracking, and basic calendar views. • Store and update customer profiles with contact details, stay history, and special notes. • Generate accurate bills and invoices, apply taxes and discounts, and export or email receipts. Three user roles have to be built in from the start: Admin (full control), Staff (front-desk and housekeeping operations), and Customer (self-service booking and account view). Role-based permissions should be enforced consistently across both platforms. I am open to the tech stack you prefer—as long as the final Android APK and a secure, responsive web app are delivered with a single shared backend. Clean UI/UX, solid database design, and clear documentation are essential. Once the main modules are complete I will test them against sample data; after that we can refine anything that isn’t running flawlessly. Let me know the framework you propose, your timeline for each module, and any previous projects that prove you can take this from concept to launch-ready software.